1. The Finite Element Method, 3rd ed, McGraw-Hill, London, 1977.
2. ‘Variational crimes in the finite element method’, Proc. Symp. on the Mathematical Foundation of the Finite Element Method with Application to Partial Differential Equations (Baltimore 1972) (Ed.), Academic Press, New York, pp. 689-710, 1972.
3. The limitations of the patch test
4. The Finite Element Method for Elliptic Problems, North-Holland, Amsterdam, 1978.
5. The consistence error of extended variational principles in the finite element method